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J Appl Microbiol. 1999 Jul;87(1):115-24.

Seasonal variation of Campylobacter types from human cases, veterinary cases, raw chicken, milk and water.

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1
ESR Ltd, Christchurch Science Centre, New Zealand. andrew.hudson@esr.cri.nz

Abstract

During August 1996 (winter) and February 1997 (summer), a total of 180 Campylobacter isolates from a restricted geographical area were obtained from human and veterinary cases, raw milk and chicken, and untreated water. Isolates were typed by Penner serotyping and pulsed-field gel electrophoresis (PFGE) of restriction enzyme-produced DNA fragments. Differences were noted between the August and February serotypes with the most, and fourth most frequently isolated serotypes in February being completely absent in August. Two other serotypes were more frequently found in the February isolates, while the reverse was true for two others. In contrast to the serotyping data, one PFGE restriction profile type was dominant in both seasons, and the pattern of distribution of isolates among the other restriction patterns was similar. Five groups of isolates in each month were indistinguishable by both typing methods. Only one group was common to both months. Another group, which was absent in August, dominated the February isolates. Marked differences in the types isolated in the two seasons were therefore evident. Some isolates from human cases were indistinguishable from others isolated from water and raw chicken, indicating possible routes of infection for humans.

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